Ammonia Lvl (AMO)

Department: Chemistry
Test Synonym(s): LAB47, AMO, Ammonia Blood, Ammonia Level, NH3
CPT Codes: 82140
Methodology: Glutamate Dehydrogenase
Reference Range: By report (reports may vary based on instrumentation)
Tube Type: Lavender top (EDTA)
Specimen: Plasma
Pediatric Requirements: 2 lavender top microtainers
Volume: 2 mL plasma
Minimum Volume: 1 lavender top (Pediatric = 2 lavender top microtainers)
Temperature: Separate within 15 min. of collection, keep on ice
Stability: 2-8C: 2 hours; -15 to -25C: 3 days; -60 to -90C: 4 weeks
Reasons for Rejection: Sample not kept on ice, hemolyzed samples
Days Performed: Daily
Times Performed: Continuous
TAT: STAT: 1 hour; Routine: 2 hours after receiving in lab
Significance: Cefoxitin (Roche) at the therapeutic drug level and Intralipid cause artificially high ammonia results. Physiological plasma concentrations of sulfasalazine may lead to erroneous results. Temozolomide at therapeutic concentrations may lead to erroneous results.
Special Instructions: Deliver to lab immediately on ice.



CLICK HERE for information on proper specimen collection

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